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RepSOC drops dramatically after 20%

Category: Hardware
Product Number: MAX17215

The battery pack is configured as 2S1P using Samsung INR18650-35E cells.

When discharging with a constant nominal current, the SOC drops sharply from 20% to 1-2%, then stays at 1% until the nVEmpty cell voltage (3.00V) is reached, then goes to 0%.

Parents
  • Here is a log showing the behavior. There are 3 full charge/discharge cycles, followed by a charge to 26% SOC (starting 7/15/2025 14:03), then 5 minutes, then discharge. SOC goes from 26% immediately to 2.9%, then falls to 1% for remainder until reaches nVempty (3.00V), then goes to 0%.SOC Drop.zip

    Included the config INI file in the zip as well.

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  • Here is a log showing the behavior. There are 3 full charge/discharge cycles, followed by a charge to 26% SOC (starting 7/15/2025 14:03), then 5 minutes, then discharge. SOC goes from 26% immediately to 2.9%, then falls to 1% for remainder until reaches nVempty (3.00V), then goes to 0%.SOC Drop.zip

    Included the config INI file in the zip as well.

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